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Unit 3

Plant Systems, Turgor Pressure, & Tropisms

TermDefinition
Photosynthesis Process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities.
Chemical Energy Energy stored in the bonds of chemical compounds.
Radiant Energy Energy of electromagnetic waves.
Chlorophyll A green pigment found in plants that they use with light to make food.
Glucose A simple sugar mainly made by plants during photosynthesis from water and carbon dioxide, using energy from sunlight.
Geotropism The turning of all or part of an organism in a particular direction in response to gravity.
Phototropism The turning of all or part of an organism in a particular direction in response to light.
Thigmotropism The turning of all or part of an organism in a particular direction in response to touch.
Hydrotropism The turning of all or part of an organism in a particular direction in response to water.
Tropism The turning of all or part of an organism in a particular direction in response to an external stimulus.
Negative Tropism The organism moves away from the stimulus.
Positive Tropism The organism moves toward the stimulus.
Stimulus A detectable change in the internal or external environment of an organism.
External Stimulus Stimulus from outside the organism.
Internal Stimulus Stimulus from within the organism.
Response Any change an organism makes because of a change in he environment.
Turgor Pressure The pressure that water-filled vacuoles exert on the cytoplasm and the elastic cell wall in a plant.
Wilting Water moves out and the plant cells and causes them to become more concave and the plant will loose its rigidity.
Osmosis Water moves in and out of a plant cell through the cell wall.
Created by: PRO Teacher dowdyp